CVE-2013-0176

Severity: medium (CVSS 4.3 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2013-02-05 · updated 2026-06-16
Weakness: CWE-399

Description

The publickey_from_privatekey function in libssh before 0.5.4, when no algorithm is matched during negotiations, allows remote attackers to cause a denial of service (NULL pointer dereference and crash) via a "Client: Diffie-Hellman Key Exchange Init" packet.

Affected products

libssh: through 0.5.3; 0.4.7, 0.4.8, 0.5.0, 0.5.0-rc1, 0.5.1, 0.5.2

References

http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098065.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098094.html
http://secunia.com/advisories/51982
http://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/
http://www.ubuntu.com/usn/USN-1707-1
https://exchange.xforce.ibmcloud.com/vulnerabilities/81595
http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098065.html
http://lists.fedoraproject.org/pipermail/package-announce/2013-February/098094.html
http://secunia.com/advisories/51982
http://www.libssh.org/2013/01/22/libssh-0-5-4-security-release/
http://www.ubuntu.com/usn/USN-1707-1
https://exchange.xforce.ibmcloud.com/vulnerabilities/81595

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